ZHMTang Borosilicate Glasses ZHMTang glass mugs are versatile and can fit most occasions! Those glasses are the perfect complement to any tableware and work well for coffee，latte,cappuccino,hot chocolate,tea or after-dinner drinks. Doulbe-walled Borosilicate Glass is Best Choice Ever to the touch. I can breathe ! In order to prevent glass mugs burst while pouring extreme hot or iced cold water, there’s a small round hole sealed with special techniques on the bottom that allows the glass mug to breathe and release. The hold is the unique trace of the manual blowing process.Not a flaw! It is sealed, the water would not go in! I am true glass, good-looking and double-walled! I am borosilicate glass, not plastic ! ZHMTang glass coffee cups are made of mouth-blown high end borosilicate glass, much more lightweight than the normal glass, but much more durable and stable, which is safe and withstands temperature from -5 ℉ to 300 ℉. How good looking I am ! The double-walled glass holds 12 Fl.Oz., not only wonderful for coffee, latte, cappuccino, cocoa, chocolate, but also great for brewing tea, other kinds of beverage or cold drinks.The smooth edge offers a tender touch to your lips. Offers a wonderful touch to hand ! Double layered borosilicate glass makes the cup comfortable to the touch, not burning your hand when the mug is filled with hot coffee and not freezing your hand when the mug is full of cold drink. 12 Fl.O.z Set of 2 16 Fl.O.z 1 Piece 8.0 Fl.O.z Set of 4 12.5 Fl.O.z Set of 2 10 Fl.O.z Set of 4 Add to Cart Buying Options Buying Options Add to Cart Buying Options Customer Reviews 3.9 out of 5 stars 10 3.9 out of 5 stars 667 3.1 out of 5 stars 4 4.4 out of 5 stars 133 5.0 out of 5 stars 2 Price $29.99$29.99 — no data — no data $19.97$19.97 — no data Borocilicate Glass ✓ ✓ ✓ ✓ ✓ Temperature tolerance ✓ ✓ ✓ ✓ ✓ Good Touch ✓ ✓ ✓ ✓ ✓ Clear Glass ✓ ✓ ✓ ✓ ✓ Light weight ✓ ✓ ✓ ✓ ✓